P物质预先给药对去甲肾上腺素诱导大鼠离体心肌细胞β1受体表达的影响

目的 探讨P物质(SP)预先给药对去甲肾上腺素(NE)诱导大鼠离体心肌细胞β1受体表达的影响.方法 出生1～3 d SD大鼠,分离心肌细胞后培养72 h.取15孔心肌细胞随机分为5组:C1组不加任何药物,NE1-4组分别给予10-9、10-8、10-7、10-6 mol/L NE,每组3孔.另取12孔心肌细胞随机分为C2组、NE组、SN组和NSN组,每组3孔,NE组加入10-7 mol/LNE,SN组加入10-6 mol/LSP后30 min加入10-7 mol/L NE,NSN组加入NK-1受体拮抗剂S3144后30 min加入10-6 mol/L SP,30min后加入10-7 mol/L NE.加入NE后3 h时采用流式细胞仪检测心肌细胞β1受体表达.结果 与C1组比较,NE1～3组心肌细胞β1受体表达上调,NE3组β1受体表达上调最明显(P＜0.05);与C2组比较,NE组心肌细胞β1受体表达上调(P＜0.05);与NE组比较,SN.组心肌细胞β1受体表达下调(P＜0.05).结论 SP预先给药可抑制NE诱导的大鼠离体心肌细胞β1受体表达上调,其机制可能与NK-1受体激活有关.

Effects of substance P pretreatment on norepinephrine-induced β1-adrenoreceptor expression in cultured rat cardiomyocytes

Objective To investigate the effects of substance P (SP) pretreatment on the expression of β1-adrenoreceptor(β1-R) induced by norepinephrine (NE) in cultured neonatal rat cardiomyecytes.Methods The cardiomyocytes obtained from 1-3 day old SD rats were cultured for 72 h.The experiment was performed in 2 parts.In part 1 the cells were seeded in 15 well plate and randomly divided into 5 groups (n=3 wells each):control group (C1)and 4 NE groups were exposed to NE 10-9, 10-8,10-7,10-6 mol/L respectively (NE1,2,3,4).In part Ⅱ the.cells were seeded in 12 well plate and randomly divided into 4 groups (n=3 wells each): group I control (C2): group II NE 10-7 tool/L; group Ⅲ (SN)was pretreated with SP 10-6 mol/L 30 minbefore NE 10-7 mol/L and group IV (NSN)was treated with NK-1 receptor antagonist (NK-1 tachykinin receptor antagonist,S3144) 30 min before SP pretreatment.After exposure to NE for 3 h the expression of β1-R in the rat cardiomyecytes was detected using flow cytometry.Results In part Ⅰ the expression of β1-R was significantly higher in group NE1-3 than in control group (C1),with the highest expression in group NF3.In part Ⅱ the expression of β1-R was significantly higher in group Ⅱ (NE) than in control group (C2) while lower in group Ⅲ (SN) than in control group Ⅱ.(NE).There was no significant difference in the expression of β1-R between group Ⅰ (C2) and group Ⅲ and Ⅳ (NSN).Conclusion Substance P pretreatment can inhibit the up-regulation of β1-R expression in cultured rat cardiomyocytes induced by norepinephrine through activating NK-1 receptor.